setValue
public Object setValue(Object value)
Set the value of this entry.  Note: In an entrySet or
 entrySet.iterator), unless the set or iterator is used under
 synchronization of the table as a whole (or you can otherwise
 guarantee lack of concurrent modification), setValue
 is not strictly guaranteed to actually replace the value field
 obtained via the get operation of the underlying hash
 table in multi-threaded applications.  If iterator-wide
 synchronization is not used, and any other concurrent
 put or remove operations occur, sometimes
 even to other entries, then this change is not
 guaranteed to be reflected in the hash table. (It might, or it
 might not. There are no assurances either way.)
- Specified by:
- setValuein interface- Map.Entry
- Parameters:
- value- the new value.
- Returns:
- the previous value, or null if entry has been detectably
 removed.
- Throws:
- NullPointerException- if the value is- null.